The thing you shouldn't have as furniture in a room? (7)
I believe the answer is:
whatnot
'room?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'the thing you shouldn't have as furniture in a' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'a' could be 'an' and 'an' is found in the leftover letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for whatnot that I've seen before include "Bric-a-brac stand" , "Portable ornament stand" , "Thingummy - display stand" , "Thingumajig" , "part of the furniture" .)